Muadh ibn Jabal

Muadh ibn Jabal (died 640) was a sahabah of Muhammad.

Biography
Muadh ibn Jabal accepted Islam before the second pledge of al-Aqba, and he was sent to Yemen by Muhammad with the goal of teaching the people about Islam. Muhammad personally bade farewell to him, walking with him for a while before telling him that he would probably be dead before Muadh returned; Muadh cried when Muhammad prophesied that only his mosque and grave would be seen in Medina on Muadh's return. When Muadh returned to Medina, Abu Bakr had already become the first caliph, and Muhammad had died. He narrated several hadiths, including one saying that the only regret that people in Paradise would have would be not spending every hour remembering God. He accompanied Usama ibn Zaid on the Syrian expedition, and he died of plague there in 640.